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Residents shop at Walmart as the store prepares for Black Friday in Los Angeles, California in a November 24, 2014 file photo. Walmart's 2015 U.S. Manufacturing Summit was advertised as a chance for goods producers to pitch American-made products to the retail giant. They would also get advice from Walmart executives on how to take advantage of the company's recent efforts to support more U.S. manufacturing jobs and reverse the trends its purchasing strategies and demand for low prices have driven. But the event also highlighted the challenges facing companies trying to bring manufacturing jobs back to the United States. Cheaper energy and rising labor costs in China have helped stabilize manufacturing employment in the U.S., but there are still roughly 5 million fewer Americans working in factories today than in 1990. REUTERS/Jonathan Alcorn/files